Measuring 24AC Current

Hi Everyone

Wondering if you guys can make a suggestion of the hardware i will need to complete my project. I am looking to have a device that will simply log when current to a 24AC device is turned on and then when it is turned off. I was looking to use the Stalker so i can log info to the SD card and then retrieve the information via USB. i would like the option of gaining information wirelessly in the future via the Bee but that is a future option.

I hope that makes sense. let me know if you require more information.